Apparatus for cutting threads on tubes and for cutting off tubes.



I v. MU'LLBR. APPARATUS FOR CUTTING THREADS 0N TUBES AND FOR GUTTING OFF TUBES.

APPLIOATION FILED JAN. 5, 1909.

1,017,898, Patented Feb. 20. 1912.

m III/11 UNITED STATES PATENT OFFICE.

VICTOR Mill-LEE, 0F BERLIN, GERMANY.

APPARATUS FOR CUTTING THREADS ON TUBES AND FOR CUTTING- OFF TUBES.

Specification of Letters Patent.

rateiitea'reb. 20, 1912.

Application filed January 5, 1909. Serial No. 470,799.

To all whom it may concern:

Be it known that I, VIo'ron Murmur, a subject of the German Emperor, and residentof Berlin, Germany, have invented certain new and useful Improvements in Apparatus for Cutting Threads on Tubes and for Cutting Off the Tubes, of which the following is a specification.

The present invention relates to a com bined threading and cutting machine for tubular bodies, and has for its purpose to provide a machine of that character wherein the piece to be worked may be threaded and out without removing the piece from 1ts originally secured position, thereby considerably reducing'the cost of manuit'acture 01" this material, and considerably expediting the time in which the work may be done.

It has heretofore been attempted to construct a combined machine which will perform the cutting and threading operations,

butin machines of that kind of theknown type there is arranged a thread cutting apparatus with screw-dies and a radially shiftable cutter for cutting oh" the tubes, but in order to perform this latter operation properly, the dies have to be'replaced by sliding blocks, butthis method has been found to be both troublesome and time-taking, since in the time required-for changing the thread cutting apparatus-to the cutting off apparatus, the piece to be Worked can be cut offwith a separate cutter far more rapidly. By the present invention, however, a single apparatus serves the double function of threading a tube or for cutting olf the same, and said apparatus is adjusted and operated through preciselythe same means.

lVith these advantages, the present invention embodies other points of merit, which will be set forth in the course of the following extended description and in the appended claims. 9

Referring to the accompanying drawing, wherein is shown the invention in its pre ferred embodiment, Figure 1 is a longitudinal sectional view of the machine; Fig. 2 is a front elevation thereof, Fig. 3 is a top plan view; Fig. 4 is a cross section on the line A-B of Fig. 3; Fig. 5 is a cross section on the line CD of Fig. 1, and Fig. dis a cross section on the line E-F of Fig. 5.

Referring to the several figures in' detail, wherein like numerals of reference indicate corresponding parts of the different figures shown, the structure comprises a substantially cylindrical casing? having an inner ring portion 8, from which projects-from three points, the bearing studs 8. Within each offlthe studs 8' is journaled a pair of clamping blocks 9, and each of the outer blocks 9 is provided with 'a crank 10 at the far end of which is fitted a pin 11. The pins 11 engage within radially disposed slots 13 of a clamping plate 14 contained within the casing 7, and .which plate has for its function to turn the clamping blocks 9 into effective position for gripping the tube 17 to be worked in precisely that manner shown in Figs. 1 and 4. The means for eifecting the operation of the clamping plate 14 comprises a worm gear 16 that is journaled within the casing 7 and engages'with teeth 15 carried on the upper peripheral edge of said clamping plate. By turning the screw 16 through the medium of a wrench or other means, the clamping plate 14 is partially rotated,.thus causing the jaws of theclamping blocks 9 to clamp between them thetuloe or piece 17 to be worked.

Mounted to rotate and have shifting movement upon the rim 8 of the casing 7, is a tubular body 18 which in turn supports, on one end, a loosely rotating band or spur gear 19, and which has its opposite end designed with a fixed spur gear 20, andtha-t surface of the body 18 intermediate the gears 19 and :20 is provided with threads 21 of different pitches. The series of threads 21 are each adapted to be engaged respectively by a pair of feeding nuts or blades 22 carried on the mandrel levers 25, which are pivoted to the casing 7 at 23, and for holding said feeding members into engagement with't-he threads, each of said levers is provided with a locking device 24 see Fig. 4). The feeding members 22 of the mandrel levers 25 have a pitch commensurate with. the pitch of their respective series of threads, in order to be able to vary the axial advance of the thread cutter according to the thread to be cut. There is also arranged in the second casing 18, a pair of vertically (he-- posed guideways 28, within which is mount ed to move the tool carrylng frame fl'i', sald movement being derived through the means of an eccentric 30, which is journaled within the frame 18 and which is provided with an operatinghandle 29. The eccentric 30,

which acts in the capacity of a cam, contacts:

directly with a wearing plate 31 which is carried by the frame 27. It is clear, howgas ever that the plate 31 may be substituted by ham 1 a slot or guideway within the frame the frame 27' (see 1); On its outer end the shaft 26 carries a spur gear 32, by

which both of the tools are operated, and which in turn derives its power from the pair of pinions 33, spur gear 34:, hand gear 19, spur gear 35, which latter is mounted on a countenshaft 36, which has at its opposite end the bevel pinion 38. The pinion 38 meshes with a like pinion carried on the shaft 37, to which is connected the operating crank 89 (see Fig.

From the foregoing, it will be readily seen that either of the tools 44 or 45 may be brought into operative position with re spect to its Work through the medium of u ,the frame adjusting means 29 and 30, and

that said tools may be brought into such position for effecting a degree of cutting which may be determined by said adjusting means. Since these tools must execute a planetary movement around the piece to be worked, there is journaled in the casing a pair of spur gears 40 which mesh with the toothed rim of the tubular casing 18 in the manner shown in Fig.6. On each of the spindles supporting the spur gears there is loosely mounted a spur gear 41, and splined on each of said spindles is also a clutch 4-2 whose function is to engage a complementary part of the wheel l1 and thereby bring the same into driving connection with a worm wheel 43, of which there are two mounted on the shaft 37 for said gear wheels. The ratio of transmission of one of the pairsof gears 41, 4:3, is different from that of the other, wherebyto vary the speed wwith which the thread cutting die makes its planetary movement around the piece to be worked. To elfect this, one or the other of the couplings 42' is thrown into position.

Assuming now that a pipe 17 has been clamped inposition for working and that the same is now to be screwthreaded, one of the levers 25 selected according to the pitch of thread desired, is lowered to bring its guiding members 22 -into engagement with its respective series of threads 21, and in this position is looked through the medium ot" the latches 2a. The crank 39 is then turned and through the train of gear- '='ust scribed, the die let performs its t ion, it being understood, oi course, tl at the tubal? is being moved longitudinally of its axis simultaneously with the planetary movement of the die 44-.

"ll-Vireo it is desired to cut a tube, the several levers are brought into inoperative position, in order that there will be no lateral movement of the piece to be out. With this effected, the cutter is then brought intooperative position through the medium of the adjustment described and the machine is then in condition for operation.

Having thus described my invention what I claim. as new therein and desire to secure by Letters Patent is 1. in a threading and shearing device, a revolublo, axially movable and around the axis of the stock rotatable spindle, in combination with a circular shearing tool and a circular threading tool, said threading tool having teeth for cutting a number of threads at once and both of said. tools socured to said spindle, and simultaneously partaking of the several movements of said spindle.

- 2. In a threading and shearing device, a

rcvoluble, axially movable, around the axis of the stock rotatable and radially displaceable spindle, in combination with a circular threading tool having teeth, for cutting a number of threads at once and a circular shearing tool, both of said tools secured to and simultaneously partaking of 'the several movements of said spindle.

3. in a threading and shearing device,,a revoluble, axially movable, around the axis of the stock rotatable and radially displaceable spindle, in. combination with a circular threading tool having teeth for cutting a number of threads at once and a circular shearing tool, both of said tools socured to and simultaneously partaking of the several movements of said spindle, and means for imparting said revoluble, rotatable and radial movements singly or in any combination to spindle and tools.

a. In a threading and shearing device the combination of a circular threading tool and a circular shearing tool mounted on one spindle, said threading tool. having teeth for cutting a number of threads at once, a tubular body or drum mounted concentrically with and revolving around the axis of the stock and constructed to impart a planetary movement to said tools and spindle, substantially as set forth.

5. In a threading and shearing device the combination of a circular threading tool and a circular shearing tool mounted on one spindle, said threading tool having teeth for cutting a number of threads atonce, a tubular body or drum mounted concentrically with, and revolving around the axis of the stock and constructed to impart simultaneously an axial movement to said tools and spindle.

6. In a threading and shearing device the combination of a circular threading tool and a circular shearing tool mounted on one spindle, said threading tool having teeth for cutting a number of threads at once, a tubular body or drum mounted concentrically with and revolving around the axis of the stock, and means for axially moving said'drum together with said spindle and tools, comprising a plurality of externally threaded portions of diiferent pitch on said drum, said threaded portions made to en gage, one atthe time, correspondingly threaded feeding levers placed across said drum, for and with the purpose of impart ing a plurality of feedingspeeds to the said tools.

tubes, comprising a stationary housing with aws for clamping the stock inside of, and concentric with said housing; a sleeve of difl'erent diameter, mounted in immediate proximity of each other on one spindle; the

smaller diameter of the tool serving for threading the pipe and having teeth for putting a number of threads at once, and the larger diameter for cutting ofi the pipe;

The foregoing specification signed at Ber lin,.Germany, this nineteenth day of De- VICTOR MULLER.

camber, 1908. .7. A threading and shearing device for In presence of HENRY HASPER, WOLDEMAR HAUPT. 

